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I. BOHLI. HIGH VOLTAGE CURRENT DISTRIBUTING APPARATUS FOR THE ELECTRICIGNITION APPARATUS OF INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY I3, I919. 1,335,933. Patented Apr. 6, 1920.

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UNITED STATES PATENT QEETUZ.

JACQUES BOI-ILI, OF OBACH, SOLOTI-IURN, SWITZERLAND, ASSIGNOR- TO FIRMSCINTILLA, 0F SOLGTHURN, SWITZERLAND.

HIGH-VOLTAGE-CURRE1\TT-DISTBIBUTING APPARATUS FOR THE ELECTRIC IGNITIONAPPARATUS 0F INTERNAL-COMBUSTION ENGINES.

Application filed May 13, 1919.

To all whom it may concern:

Be it known that I, JAo Uns Bonn, a citizen of the Swiss Republic,residing at Obach, Solothurn, Switzerland, have invented certain new anduseful Improvements in High-Voltage-Current-Distributing Apparatus forthe Electric Ignition Apparatus of Internal-Combustion Engines, of whichthe following is a specification.

ln high voltage ignition apparatus for internal combustion engines thedistribution of the high voltage current to the several engine cylindershas been effected hitherto by closing alternately the ignition circuitsof the several cylinders by means of mechanically actuated devices.

The present invention has for its object to enable the motion ofmechanical devices for this purpose to be dispensed with in the ignitionof internal combustion engines, and to effect the distribution by purelyelectrical means in systems employing a magneto or other alternatingcurrent generator. This is done by arranging the points of ignition forthe several engine cylinders in two ,ignition circuits which areconnected to each other in parallel and which include devices that allowthe current to pass through only in one direction, and are soconstructed as to allow of the current passing through the two ignitioncircuits in mutually opposite directions.

Since voltage waves are generated in alternately opposite directions bythe ignition apparatus, an ignition current will flow in one of the twoignition circuits only when the voltage at the high voltage terminals ofthe apparatus acts in one direction, and will flow in the other ignitioncircuit only when the voltage is acting in the opposite direction.Consequently ignitions at different ignition points will take place insuccession or simultaneously according as these ignition points aresituated in different ignition circuits or in one and the same ignitioncircuit.

constructional forms of this invention are illustrated by way of examplein the accompanying diagrammatic drawings in which ratus according tothis invention for dis- Specification of Letters Patent.

Patented Apr. 6, 1920.

Serial No. 296,762.

tributing high voltage current to two cylinder engines. Figs. 2 and 3illustrate modifications of this invention applied to a four-cylinderengine. The ignition apparatus comprises in the usual manner alowvoltage coil a, condenser c and interrupter I), and a high-voltagecoil d at the ends of which latter the ignition circuits are connectedto the sparking plugs 7L and 2'. These ignition circuits are connectedto each other in parallel at the points 6 and K.

Each of these ignition circuits includes a device f and g respectively,which acts in the manner of a rectifier. These devices are connected tothe circuits in such a way that the device 7 is connected by way of itscathode to the sparking plug It, while the other device 9 is connectedby way of its anode to the sparking plug z'.

According as the current waves emanating alternately in oppositedirections from the high tension coil, flow from the point e of thecircuit toward or away from the sparking plugs, they will pass throughthe circuit of the sparking plug it or through the circuit of thesparking plug 2', and in this manner produce the successive ignitionsalternately in the two cylinders of the 611 1116.

E01 producing ignitions alternately in four-cylinder engines, anarrangement may be employed as shown in Fig. 2. In this figurecorresponding parts are indicated by the same letters as in Fig. 1.

In each of the circuits (that are connected to each other in parallelbetween the points e and K) there is included a pair of sparking plugs h72, and z 2" respectively, in addition to a rectifier f and grespectively. The two pairs of sparking plugs receive current inalternate succession.

Igniting sparks are produced simultaneously at the two sparking plugs ofeach respective pair h and h and i and '11. Of these sparks one servesfor ignition while the other is unused, according to the phase of theworking operations in the respective cylinder.

The connection of the sparking plugs 7L and 2' between the rectifiersand g on one hand, and of the sparking plugs h and i on the other handnecessitates a special construction of the two first-mentioned sparkingplugs With insulated electrodes on both sides.

If instead of sparking plugs of special construction it is desired toemploy the ordinary type of sparking plug wherein one electrode issituated on the frame, then a mode of connection of the kind illustratedin Fig. 3 may be used. In this arrangement two pairs of rectifiers f, gand f g are respec tively inserted on either side of the circuits thatare connected in parallel with each other at the points 6 and K. Oneelectrode of each of the sparking plugs h i and h t" are connectedrespectively to these circuits,

' circuit of the low-voltage coil a with the condenser 0 and interrupter6 must be insulated from the high-voltage circuit of the sparking plugs.

What I claim is In a high-voltage current distributing apparatus for theelectric ignition apparatus of internal combustion engines, thecombination of two ignition circuits connected to each other inparallel, two ignition points for each engine cylinder locatedrespectively in said two ignition circuits. and two current-rectifierslocated respectively in'said two ignition circuitsx, so connected andoperat'ingas to cause said two ignition. circuits to allow the ignitingcurrent to How in them in mutually opposite directions.

In testimony whereof I have signed my name to this specification.

JACQUES BOHLI.

